The observations were obtained in 1994 May and 1995 June at the European Southern Observatory (ESO), using the 3.55 m New Technology Telescope (NTT) equipped with the SUSI camera and a

thinned Tektronix ESO CCD # 25 at the Nasmyth focus B; the pixel size is

(0.13'' on the sky), and the frame size is

. Observations were also obtained at the 1.54 m Danish telescope in 1994 May, using the Tektronix CCD ESO # 28 of

pixels, with pixel size

(0.37'' on the sky). The full field is

. The log-book of observations is given in Table 1 (click here).

Figure 1: NTT-SUSI V image of Terzan 10. The field size is

. North is up and West is to the right

Figure 2: Danish V image of ESO

38. The field size is

. North is up and West is to the right

Figure 3: NTT-SUSI Gunn z image of UKS 1. The field size is the same as in Fig. 1 (click here). North is up and West is to the right

The reductions were carried out using DAOPHOT II. For the calibrations standard stars by Landolt (1983, 1992) were used. Details on the procedures are given in Ortolani et al. (1996a). For the 1994 run, the calibrations were carried out using the Danish observations, since the NTT observations were not photometric (see also the study of Terzan 2 observed in the same run by Ortolani et al. 1997). The photometric errors arise mostly from the zero point accuracy (

) and the magnitude transfer from the cluster images to the standard stars due to the crowded field, which can amount to 0.05 mag at the fainter magnitudes. The magnitude calibrations concern only V and I, whereas Gunn z magnitudes are instrumental.

The V, I and Gunn z data are given in Tables 2, 3 and 4 respectively for Terzan 10, ESO

38 and UKS 1 (where magnitudes, colours and X, Y coordinates corresponding to pixels in Figs. 1 (click here), 2 (click here) and 3 (click here) are reported), available only in electronic form at the CDS-Strasbourg.

**Table 1:** Log-book of observations


I	17.05.1994		60	0.7
I			360	0.7
V			600	0.8
I	20.05.1994	Danish	60	1.5
V			900	1.5
I	17.05.1994		60	0.9
V			180	0.8
z			60	0.8
I	20.05.1994	Danish	60	1.5
V			120	1.5
I	23.06.1995		60	0.7
I			300	0.75
V			600	0.8
z			300	0.7
z			30	0.7

2. Observations